The document discusses various input devices used with computers, including keyboards, mice, microphones, and scanners, explaining their functions and how they convert input into a binary format for computer processing. It details the working principles of these devices, such as clicking, double-clicking, and dragging with a mouse. Additionally, it mentions the use of compact discs for data storage and transfer.

1. INPUT DEVICES

3. INPUT DEVICES
• The input unit is formed by the input devices
attached to the computer. Ex - Keyboard,
Microphone etc.
• An input device takes the input & converts it
into binary form so that it can be understood
by the computer.

4. purpose of a computer input
device
•To input some sort of data into the computer.
• A keyboard is an input device that inputs
characters...
•A microphone is an input device that inputs
sound...
•CD ROM drive is an input device that inputs
data.

5. Camera
most cameras like this are used during live
conversations. The camera transmits a
picture from one computer to another, or
can be used to record a short video.

6. Compact Disc (CD)
• CDs store information.
• The CD can then be put into another
computer, and the information can be opened
and added or used on the second computer.
• A CD-R or CD-RW can also be used as an
OUTPUT device.

7. Keyboard
• The keyboard is a way to input letters or
numbers into different applications or
programs.
• A keyboard also has special keys that help
operate the computer.

8. Mouse
MOUSE
• This is a pointing device which contains a roller in its
base.
• When the mouse is moved on any surface, the pointer
on the screen is also moved.
• It contains a potentiometer coupled with the roller.
• This potentiometer senses the motion of mouse &
convert it into digital value.
• A mouse may contain two or three buttons.

9. Microphone
• A microphone is used to record sound. The
sound is then saved as a sound file on the
computer.

10. Scanner
A scanner is used to copy pictures or
other things and save them as files
on the computer.

11. Mouse
A device that controls the
movement of the cursor
or pointer on a display
screen

12. Working principle
• 1. When the left button of mouse is pressed and released quickly
then this we can say ' clicking the mouse '.
•
2. The double clicking is used to initiate some action on the selected
item. Basically it selects and initiases the action. For this the enter
key is pressed and relieased sticky twice.
•
3. If AN object is to be moved from one part of screen to other part
then dragging is used.
•
4.For this bring the pointer to the required object , press the key
and hold it while moving to other place. When the mouse pointer
reaches at required position , release the button.
•
5.I think that the all the given work is hands of mouse